Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document.
Note: Even the most advanced machine translation cannot match the quality of professional translators.
Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).

Displaying and Maintaining the Routing Management Module

Displaying and Maintaining the Routing Management Module

Context

If the device imports
a large number of routes, system performance may be affected when
services are being processed because the routes consume a lot of system
resources. To improve system reliability, configure a limit on the
number of public route prefixes. When the number of public route prefixes
exceeds the limit, an alarm is generated, prompting you to check validity
of public route prefixes.

By default, the maximum number of IPv6 public
route prefixes is not limited.

alert-percent specifies the percentage
of the maximum number of supported public route prefixes. If you specify alert-percent in the command, an alarm is generated when
the number of public route prefixes exceeds the value calculated by
the following formula:

(number x alert-percent)/100

New public route prefixes can
still be added to the IP routing table until the number of public
route prefixes reaches the value of number. Subsequent
route prefixes will then be discarded.

If you specify simply-alert in the command, new public route prefixes
can still be added to the IP routing table and only an alarm is generated
after the number of public route prefixes exceeds the value of number. However, when the total number of private and public
route prefixes reaches the limit on the number of unicast route prefixes
specified in the PAF file, subsequent public route prefixes will be
discarded.

If you decrease the value of alert-percent after the number of public route prefixes exceeds the value of number, whether the IP routing table remains unchanged
depends on whether route-unchanged is specified
in the command:

If it is specified, the IP routing table remains unchanged.

If it is not specified, the system deletes all the routes from
the IP routing table and re-adds routes to the IP routing table.

NOTE:

After the number of public route prefixes
exceeds the limit, note the following rules:

If you run the ip prefix-limit command to increase the
value of number or run the undo ip prefix-limit command to remove the limit, the device relearns IPv4 public
route prefixes.

If you run the ipv6 prefix-limit command to increase the
value of number or run the undo ipv6 prefix-limit command to remove the limit, the device relearns IPv6 public
route prefixes.

Direct and static routes can still be added to the IP routing
table.

(Optional) Run ip prefix-limit log-intervalinterval

An interval at which
the system generates logs after the number of public route prefixes
exceeds the limit is configured.

By default, the system generates
logs at an interval of 5s after the number of public route prefixes
exceeds the limit.

You can set a longer interval to decrease
the frequency at which the system generates logs.